smart-green-house-server-and-front-end/cgi-bin/mqtt_pub_stoc.c

#include "includes/mosquitto.h" // mqtt
#include "includes/sqlite3.h"   // sqlite3
#include <stdbool.h>            // bool
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int isConnected = 0;

void connect_callback(struct mosquitto *mosq, void *obj, int rc)
{
    if (rc == 0)
    {
        printf("---连接服务器成功---\n");
        isConnected = 1;
    }
}
int main(int argc, char const *argv[])
{
    if (argc < 3)
    {
        printf("format: %s msgid topic msg", argv[0]);
        return -1;
    }
    mosquitto_lib_init();                                       // 初始化（固定格式）
    struct mosquitto *client = mosquitto_new(NULL, true, NULL); // 创建客户端
    mosquitto_connect_callback_set(client, connect_callback);   // 设置连接回调函数
    mosquitto_connect(client, "localhost", 1883, 60);         // 连接服务器(地址，端口，超时时间)
//    mosquitto_connect(client, "flykhan.com", 1883, 60);         // 连接服务器(地址，端口，超时时间)
    mosquitto_loop_start(client);                               // 开启客户端线程
    while (isConnected == 0)
        ; // 等待连接成功(当连接成功后，isConnected会被置为1，然后跳出循环)

    int msg_id = atoi(argv[1]);                                                      // 消息ID
    char *topic = (char *)argv[2];                                                   // 主题
    char *msg = (char *)argv[3];                                                     // 消息
    int flag = mosquitto_publish(client, &msg_id, topic, strlen(msg), msg, 1, true); // 发布消息

    // 发布成功
    if (flag == MOSQ_ERR_SUCCESS)
    {
        printf("---消息发布成功: %s(%d):%s---\n", topic, msg_id, msg);
        mosquitto_destroy(client);
        mosquitto_lib_cleanup();
    }

    return 0;
}